The first Earth Day was held on April 22, 1970, and is credited with raising public awareness about environmental issues.

David Orr is widely recognized as the father of environmental education for his pioneering work in the field and his influential book, "Ecological Literacy: Education and the Transition to a Postmodern World".

Rachel Carson's book, "Silent Spring", published in 1962, brought widespread attention to the harmful effects of pesticides on the environment and human health.

The Paris Agreement, adopted in 2015, is a legally binding international treaty on climate change. Its goal is to limit global warming to well below 2 degrees Celsius, preferably to 1.5 degrees Celsius, compared to pre-industrial levels.

The United Nations Environment Programme (UNEP) was established in 1972 following the United Nations Conference on the Human Environment held in Stockholm, Sweden.

UNESCO has developed several environmental education programs, including Education for Sustainable Development (ESD), Global Action Programme on Education for Sustainable Development (GAP-ESD), and United Nations Decade of Education for Sustainable Development (UNDESD).

Sweden was the first country to introduce environmental education as a compulsory subject in schools, starting in the 1970s.

The Network for Environmental Education and Communication (NEEC) is an international network of environmental educators that aims to promote environmental education and communication worldwide.

The United States Environmental Protection Agency (EPA) has developed several environmental education programs, including Project Learning Tree, Project WET, and Project WILD.

Project WET is an environmental education program that focuses on teaching students about water resources, water quality, and water conservation.

Project WILD is an environmental education program that uses wildlife to teach students about ecology, wildlife conservation, and habitat protection.

The first International Conference on Environmental Education was held in Belgrade, Yugoslavia, in 1975.

The World Wildlife Fund (WWF) has developed several environmental education programs, including the Living Planet Program, Global 200 Program, and Species Action Program.

The Living Planet Program is an environmental education program that focuses on teaching students about biodiversity, ecosystems, and the importance of conservation.

The Species Action Program is an environmental education program that focuses on teaching students about endangered species, their habitats, and the threats they face.